{60 (m-alkoxyphenoxy) and {60 (m-trifluoro-methylphenoxy) m-toluic acids

ABSTRACT

WHEREIN: A is oxygen, sulfur, imino- or lower-alkylimino, and R1 and R2 are hydrogen, halogen, lower alkoxy or trifluoromethyl, provided that R1 and R2 are not simultaneously hydrogen, when A is oxygen. These compounds possess thrombolytic, fibrinolytic, vascular brittleness inhibiting and immunodepressant activities. Meta-toluic acid Alpha -substituted by the radical of the formula

United States Patent 1191 Malen et a1.

Apr. 17, 1973 a(M-ALKOXYPHENOXY) AND a(M- TRIFLUORO-METHYLPHENOXY) M- TOLUIC ACIDS Inventors: Charles Malen, Fresnes; Bernard Danre, St. Germain en Laye; Pierre Desnoyers, Fontenay aux Roses, all of France Societe en nom Collectiv Science Union a Cie, Societe Francaise de Recherche Medicale, Suresnes,

' France Filed: Dec. 29, 1969 Appl. No.: 888,941

Assignee:

Q Foreign Application Priority Data [56] References Cited OTHER PUBLICATIONS Exner Chem. Abst. 61 4192 d (1962) Boehringer et 21., Ibid 60 10659 Primary ExaminerI-lenry R. Jiles Assistant Examiner-John F. Terapane Attorney-Cifelli, Behr'and Rhodes ABSTRACT Meta-toluic acid a-substituted by the radical of the formula wherein:

A is oxygen, sulfur, iminoor lower-alkylimino, and R and R are hydrogen, halogen, lower alkoxy or trifluoromethyl, provided that R; and R are not simultaneously hydrogen, when A is oxygen.

These compounds possess thrombolytic, fibrinolytic, vascular brittleness inhibiting and immunodepressant activities.

3 Claims, No Drawings a(M-ALKOXYPHENOXY) AND a(M-TRTFLUORO- METHYLPHENOXY) M-TOLUIC ACIDS The present invention provides meta-toluic acid compounds of the general formula I wherein A is selected from the group consisting of an oxygen atom, a sulfur atom and an imino radical of the formula -NH or NR- wherein R represents a lower alkyl radical containing from one to five carbon atoms inclusive, and

R, and R are the same or different and each is selected from the group consisting of a hydrogen atom, a halogen atom, a lower alkoxy radical containing from one to five carbon atoms inclusive, and a trifluoromethyl radical, provided that R, and R are not simultaneously a hydrogen atom, when A is an oxygen atom.

The compounds of the general formula I are new and may be prepared by reacting an a-halo-meta-toluic acid or one of itsesters ofthe general formula II (.JIr-X (lll) wherein A, R, and R have the meanings given above.

- The reaction may be carried out in a suitable solvent, such, for example, as an aliphatic alcohol, an ether, a ketone, a hydrocarbon, an aliphatic nitrile or the nitrornethane, at a temperature within the range of from 20 to -50C, in the presence of an acceptor for the hydrohalic acid formed during the reaction. This acceptor may be an alkali or alkaline earth metal salt of carbonic acid such, for example, as sodium or potassium carbonate, or in the case where A represents NH-- or -NR, an excess of the compound of the general formula Ill.

The compounds of the general formula I may be converted into addition salts with mineral or organic bases such, for example, as alkaline or alkaline earth metals hydroxides, primary, secondary and tertiary amines, such as monodiand triethylamines, and heterocyclic bases such, for example, as piperazine, piperidine, morpholine, etc. These salts are also included in the present invention.

The following examples illustrate the invention. Melting points are determined on a Kofler bank.

EXAMPLE 1 a-phenylthio-meta-toluic acid 2.52 g of thiophenol was added to a suspension of 9.50 g of anhydrous potassium carbonate in 150 ml of anhydrous acetone. The stirring was maintained for 10 minutes, then the reaction mixture was refluxed, and a solution of 5 g of a-bromo-meta-toluic acid in 50 ml of anhydrous acetone was dropped while stirring vigorously. The reflux was maintained for 3 hours, then the inorganic precipitate was filtered off and washed with acetone. The acetonic filtrates were evaporated. The residue taken up with water was acidified with hydrochloric acid.

The precipitate of a-phenylthiometa-toluic acid was suctioned off, washed with water and dried. 4.7g of crude a-phenylthio-metatoluic acid were obtained (yield 84 percent). After recrystallization from ml of cyclohexane, 4 g of a-phenylthio-meta-toluic acid were obtained. Melting Point 100-l 01C.

EXAMPLE 2 a-(para-anisidino) meta-toluic acid 5 g (0.023 mole) of a-bromo-meta-toluic acid were added gradually to a solution of 5.66 g (0.046 mole) of para-anisidine in ml of ether, while refluxing. The reflux was maintained for 9 hours.

The anisidine hydrobomide was suctioned off and washed with ether. The ethereal phases were extracted with a sodium hydroxide solution.

The alkaline phases were acidified, until pH 4-5, with a solution of hydrochloric acid. 4.2 g of crude product, melting at l20l25C, were obtained. After recrystallization from 20 ml of benzene, 3.4 g of a-(paraanisidino) meta-toluic acid were obtained. Melting Point l25-l26C.

EXAMPLE 3 a-(meta-methoxyphenyloxy) meta-toluic acid anhydrous acetone.

The reactionmixture was refluxed for 3 hours, then acetone was evaporated, and the residue was taken up with watenTh'e oily residue formed was extracted with etherrThie ehtereal phases washed with water, were dried and evaporated. The residue was distilled and 39 g: of methyl a-(meta-methoxyphenyloxy) meta-toluate were obtained. Boiling point (0.01 mm Hg) 155- The ester so obtained was saponified, under reflux, with 100 ml of a percent solution of hydro-alcoholic potassium hydr'oxide,for Pia-hours. The alcohol was evaporated and the residue taken up with water. The aqueous phase was extracted with ether then acidified.

The crude a-(meta-methoxyphenyloxy) meta-toluic acid was extracted with ether. The organic solution was evaporated, -and' .42 g of product were obtained. This product recrystallized from 140 ml-of aqueous ethanol 1 gave 32.1' g of a-(meta-methoxyphenyloxy) meta-toluicacid, metling at 92 -93 C. V

' EXAMPLE 4 a- (para -fluoroanilino) meta-toluic acid I 1-0 g of'methyl a bromo-meta-toluatein 30 m1 of anhydrous ether were added, while refluxing and stirring, to a solution of 20.4 g of redistilled para-fluoroaniline in 50 ml of anhydrous ether. After refluxing for 8 from hours, the precipitate of fluoroaniline hydrobromide was suctionedoff. The ethereal phase was evaporated and the residue was treated with diluted hydrochloric acid. The methyl a-(para fluoroanilino) meta-toluate hydrochloride so obtained was saponified with a slight potassium hydroxide, and according to the'method given in Example 3, 6.5 g of a-(pa'rarfluoroanilino) meta'toluic acid. were obtained. Melting Point l.40l4

- excess of a IQ-percent solutionof hydro-alcoholic 15 g of methyl a-bromo-meta-toluate in 40 ml of xylene were added, while stirring, to a solution of- 18.4

g of para-chloro-N-methylaniline in 50 ml of boiling xylene. The reaction mixture was refluxed for 2 hours. I

was obtained, according to the i'nethoclpreviously' described. After recrystallization in amixture of 100 ml of benzene and 35 ml of cyclohexane, 9.5 got .a- (parachloro-N-rnethylanilino). meta-toluic acid were obtained. MeltingPointl54-155C.

EXAMPLES 6 1 1 The following compounds were prepared according to the method described in the previous examples 6. a-(para-chlorophenylthio) meta-toluic acid,

Melting Point l26128C (cyclohexane), "starting a-bromo-meta-toluic chlorothiophenol. 7. a-(para-chloroanilino) meta-toluic acid, Melting Point l541'56C (ethanol/water), starting from a-bromo-meta-toluic acidand para-chloroaniline. 8.a-(para-chlorophenyloxy) meta-tol uic acid, MeltingPoint 134136C (benzene);starting'ifrorn a-bromo-metatoluic acid and para-chlorophenol. 9.

acid, a

' Melting Point from a-bromo-meta-toluic' trifluoromethylphenol. I a l0. a-(ortho-chlorophenyloxy) meta-toluic acid,

Melting Point' 1 45-147" C- (cyclohexane/benzene), starting from a-brom'o-meta-toluic. acid and orthochlorophenol. f I l 1. a-(2,6 dichloropheny1oxy) meta-toluic acid,

Melting Point 2279-228C,' {with sublimation (ethanol), starting from;d-bromo-ineta-toluic acid and 2,6-dichlorophenol.

The new compounds of the present invention andtheir physiologically tolerable addition salts possess valuable pharmacological and therapeutic properties especially thrombolytic, fibrinolytic, vascular brittleness inhibiting and immunodepressant activities.

Their toxicity islow and the LD varies from 250 to 1 ,000 mg/kg by the oral route in mice.

875 rng/kg by intraperitoneal route and from 590 to r The thrombolytic activitywas studied in vitro by the method of von Kaulla (Thromb.al)iath.l-1aem. 5 14789 (1961)) on the standard bloo d elot. It was observed that they provoke the lysis of the'clot at 0.008 to 0.04

molar concentrations, 'correspondingto concentrations between 1.95 and 12.85 mg/ml. 5

A similar effect may be observed method of S. ,Wessler (J. Clin. Invest. 34 647 (1955)).

- The'new compounds inhibit totally or partially the thrombosis in the vena jugularis of rabbits, provoqued by injection of a heterologousserum at the dose of 50 mg/kg LV. This effect is due to both thefibrinolytic and I immunodepressant properties of the new products.

acid "and. paraa- (meta-trifluoromethylphenyloxy) metatoluic 1 l 8-1 19C (ethanol/water), starting v acid and 9 mats-- in vivo the When administered orally at doses of 50 to 100 mg/kg in rat, the new compounds decrease from 21 to 33 percent the euglobulin lysis time 30 to 90 minutes after the administration (von Kaulla Am. J. Clin. Path. 29 l04(l958)).

The new compounds decrease also the capillary permeability. By the test of Ambrose and Eds (J. Pharm. Exp. Therap. 90 359 (1947)), it was observed that they delay from 70 to 190 percent the appearance of the blue coloration on the depilated abdomen skin of the rabbit after injection of 2 cm of trypan blue at 1 percent, when administered intraperltoneally at doses of 50 to 300 mg/kg.

The new compounds can be used in therapy, especially in the treatment and the prevention of blood hypercoagulability, thromboembolic diseases, vascular brittleness and as immunodepressant The invention also provides pharmaceutical compositions containing compounds of the general formula I or physiologically tolerable salts thereof in admixture or conjunction with suitable pharmaceutical carriers, such as, for example, distilled water, glucose, lactose, starch, talc, magnesium stearate, cocoa butter. These pharmaceutical compositions may be in form of tablets, dragees, capsules, suppositories or solutions, in order to be administered by oral, rectal or parenteral route at the doses of 10 to 500 mg l to 5 times a day.

We claim 1. A compound selected from the group consisting a. meta-toluic acid compounds of the formulal wherein:

3. A compound of claim 1 which is oz-(metatrifluoromethylphenyloxy) meta-toluic acid. 

2. A compound of claim 1 which is Alpha -(meta-methoxyphenyloxy) meta-toluic acid.
 3. A compound of claim 1 which is Alpha -(meta-trifluoromethylphenyloxy) meta-toluic acid. 